Theory of two-photon processes in quantum dots: coherent evolution and phonon-induced dephasing

TL;DR

This paper models two-photon processes in quantum dots, analyzing coherent evolution and phonon-induced dephasing, and identifies optimal conditions for high-fidelity quantum control.

Contribution

It provides a theoretical framework for understanding two-photon Rabi oscillations in quantum dots, including phonon effects and optimal control strategies.

Findings

High-fidelity control of biexciton states achieved

Phonon-induced decoherence effects characterized

Optimal optical driving conditions identified

Abstract

The paper discusses two-photon Rabi oscillations between the ground state of a quantum dot and the biexciton state, as well as two-photon oscillations between the two single-exciton states with different circular or linear polarizations. The effect of phonon-induced decoherence on these processes is described and optimal system properties and optical driving conditions for coherent control are identified. It is shown that proper optimalization allows one to control the biexciton system via two-photon transitions with a high fidelity.